A small full-sealed solid insulation switch

Abstract

The application relates to a small full-sealed solid insulation switch, which comprises a mechanism box and an insulation cylinder, the mechanism box comprises a box body and a box cover, the insulation cylinder comprises a cylinder body made of epoxy resin and a circuit breaker assembly, an isolating switch assembly and a grounding assembly in the cylinder body, the outer surface of the cylinder body is provided with a metal layer made by a thermal zinc spraying process, the cylinder body is sealingly fixed on the box body, the circuit breaker assembly comprises an incoming line conductor and a vacuum arc-extinguishing chamber, the vacuum arc-extinguishing chamber dynamic contact is connected with a circuit breaker mechanism in the mechanism box through an insulation pull rod, the isolating switch assembly comprises an outgoing line conductor, an isolating support seat and an isolating dynamic knife, the isolating dynamic knife is connected with an isolating grounding mechanism in the mechanism box through an isolating pull rod, the grounding assembly comprises a grounding static contact fixed in the inner cavity of the cylinder body and electrically connected with the vacuum arc-extinguishing chamber dynamic contact and the isolating support seat, and the isolating grounding mechanism is provided with a grounding dynamic contact matched with the grounding static contact. The switch has the advantages of compact structure, good safety, high reliability and strong practicability.

Description

Technical Field

[0001] This invention relates to an insulated switchgear, specifically to a small, fully sealed solid insulated switch in which both the circuit breaker and the isolating / grounding switch are housed in an epoxy resin housing. Background Technology

[0002] In the field of power transmission and distribution, traditional switchgear is mainly SF6 gas-insulated switchgear. This type of switchgear is not only large in size, high in production cost, and low in assembly efficiency, but also releases greenhouse gases during use, affecting the surrounding environment and air quality, which does not meet the environmental protection requirements of modern social development concepts. Summary of the Invention

[0003] The purpose of this invention is to provide a small, fully sealed solid-insulated switch, which has the advantages of compact structure, low cost, good safety, high reliability and strong practicality.

[0004] To address the aforementioned problems in the prior art, this invention provides a small, fully sealed solid-insulated switch, comprising a mechanism box and insulating cylinders. The mechanism box includes a box body and a box cover sealed and fixed to the opening side of the box body. Three insulating cylinders are provided, each comprising a cylinder body made of epoxy resin and a circuit breaker assembly, a disconnector assembly, and a grounding assembly housed within the cylinder body. The outer surface of the cylinder body is provided with a metal layer made using a hot-spray zinc process. The opening end of the cylinder body is sealed and fixed to the box body. The circuit breaker assembly includes an incoming conductor and a vacuum interrupter, both enclosed within the cylinder body. One end of the incoming conductor extends out of the cylinder body, and the other end is connected to the stationary contact of the vacuum interrupter. The moving contact of the vacuum interrupter faces the inner cavity of the cylinder body and is connected to the circuit breaker mechanism housed in the mechanism box via an insulating pull rod. The disconnector assembly includes an outgoing conductor, an isolation support base, and an isolation moving blade. The outgoing conductor is enclosed within the cylinder body. One end extends out of the cylinder, and the other end of the outgoing conductor is provided with a slot facing the inner cavity of the cylinder. A first spring contact finger is installed on the inner wall of the slot through a first annular limiting groove. An isolation support is fixed in the inner cavity of the cylinder. The isolation support is provided with a through hole. A second spring contact finger is installed on the inner wall of the through hole through a second annular limiting groove. An isolation moving knife passes through the through hole and the second spring contact finger of the isolation support. One end of the isolation moving knife is matched with the slot of the outgoing conductor. The other end of the isolation moving knife is connected to the isolation grounding mechanism provided in the mechanism box through an isolation pull rod. The grounding assembly includes a grounding stationary contact fixed in the inner cavity of the cylinder and electrically connected to the moving contact of the vacuum interrupter and the isolation support. A third spring contact finger is installed on the inner wall of the grounding stationary contact through a third annular limiting groove. A grounding moving contact that cooperates with the grounding stationary contact is installed on the isolation grounding mechanism. The grounding moving contact is connected to the grounding busbar provided in the mechanism box.

[0005] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the cylinder is provided with an irregularly shaped high-voltage shielding mesh and an internally threaded post connected to the high-voltage shielding mesh, the moving contact and the isolation support of the vacuum interrupter are located in the high-voltage shielding mesh, the grounding stationary contact and the isolation support are fixed to the internally threaded post by connecting bolts, and the grounding stationary contact is connected to the moving contact of the vacuum interrupter through a conductive flexible connection.

[0006] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the extended end of the incoming conductor and the epoxy resin wrapped around it form an incoming bushing, and an incoming bushing shielding mesh through which the incoming conductor passes is provided in the cylinder at the root of the incoming bushing; the extended end of the outgoing conductor and the epoxy resin wrapped around it form an outgoing bushing, and an outgoing bushing shielding mesh through which the outgoing bushing passes is provided in the cylinder at the root of the outgoing bushing.

[0007] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the cylinder is provided with an arc-extinguishing chamber stationary end shielding mesh and an isolation stationary seat shielding mesh, the arc-extinguishing chamber stationary end shielding mesh and the isolation stationary seat shielding mesh being connected to the incoming conductor and the outgoing conductor respectively, the end of the incoming conductor connected to the vacuum arc-extinguishing chamber and the stationary contact of the vacuum arc-extinguishing chamber are both located in the arc-extinguishing chamber stationary end shielding mesh, and the end of the outgoing conductor with the slot is located in the isolation stationary seat shielding mesh.

[0008] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the cylindrical body is provided with a current transformer, a first capacitor power supply device, and a second capacitor power supply device. The current transformer is disposed around the incoming conductor, and the first capacitor power supply device and the second capacitor power supply device are respectively connected to the incoming conductor and the outgoing conductor via wires.

[0009] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the end of the slot for setting the outgoing conductor is provided with a temperature sensor for monitoring the temperature of the main circuit, the insulating pull rod is provided with a pressure sensor for monitoring the contact pressure of the vacuum interrupter, and the isolation grounding mechanism integrates a displacement sensor for monitoring the movement distance of the isolation moving knife and the grounding moving contact.

[0010] Furthermore, this invention provides a small, fully sealed solid-insulated switch, wherein the enclosure cover is provided with an interlocking mechanism for operating the circuit breaker mechanism and the grounding isolation mechanism. The interlocking mechanism includes a closing shaft, a opening shaft, an opening / closing indicator shaft, a grounding operation shaft, and an isolating operation shaft rotatably mounted on the enclosure cover. The inner ends of the closing shaft, opening shaft, and opening / closing indicator shaft are respectively connected to the circuit breaker mechanism. A closing lever is fixed to the outer end of the closing shaft, and a swing arm is fixed to the outer end of the opening / closing indicator shaft. The inner ends of the grounding operation shaft and the isolating operation shaft are respectively connected to the grounding isolation mechanism. A grounding cam and an isolating cam are respectively fixed to the outer ends of the grounding operation shaft and the isolating operation shaft. The interlocking mechanism also includes a sliding closing interlock plate, a circuit breaker interlock plate, and a grounding interlock plate. A first reset mechanism is provided between the closing interlock plate and the enclosure cover. The lower end of the closing interlock plate abuts against the closing... On the switch lever, the upper end of the closing interlock plate is provided with an interlock assembly that cooperates with the grounding cam and the isolating cam. When the grounding is closed, the interlock assembly blocks the isolating operating shaft. When the isolating is closed, the interlock assembly blocks the grounding operating shaft. When the grounding is open and the isolating is open, the interlock assembly prevents the closing interlock plate from moving upward. The middle of the circuit breaker interlock plate is provided with a first elongated hole in the left-right direction. A lever fixed on the swing arm is provided in the first elongated hole. The lower end of the circuit breaker interlock plate is matched with the cable compartment door of the switch cabinet. The upper end of the circuit breaker interlock plate is U-shaped and is provided with a grounding shaft baffle and an isolating shaft baffle that block the grounding operating shaft and the isolating operating shaft respectively when the circuit is closed. A second reset mechanism is provided between the grounding interlock plate and the box cover. The lower end of the grounding interlock plate is matched with the cable compartment door of the switch cabinet, and the upper end of the grounding interlock plate is matched with the grounding cam.

[0011] Furthermore, this invention provides a small, fully sealed solid-insulated switch, wherein the interlocking assembly includes a U-shaped support plate and an interlocking component. The rear side plate of the U-shaped support plate is fixed to the box cover. The bottom plate of the U-shaped support plate has a first through hole corresponding to the closing interlocking plate. The front side plate of the U-shaped support plate has a first guide hole and a second guide hole in the left-right direction. The second guide hole is located at the lower right side of the first guide hole. A first support member and a second support member are fixed to the right side of the first guide hole and the left side of the second guide hole, respectively. The interlocking component is located inside the U-shaped support plate and includes a closing baffle and an interlocking baffle connected to each other. The closing baffle has a second through hole and a third through hole distributed in the left and right directions. The two ends of the closing baffle are corresponding to the interlocking components. The grounding cam and the isolation cam cooperate to form a grounding push plate and an isolation push plate. The two ends of the interlock baffle protrude from the grounding push plate and the isolation push plate respectively. The interlock baffle is provided with left and right strip holes at positions corresponding to the first support member and the second support member. The interlock baffle is fixed with a first guide member and a second guide member corresponding to the first guide hole and the second guide hole. A return spring is provided between the first guide member and the first support member, and between the second guide member and the second support member respectively. When the grounding is closed, the interlock member moves to the left and makes the second through hole coincide with the first through hole. When the isolation is closed, the interlock member moves to the right and makes the third through hole coincide with the first through hole. When the interlock member is in the middle position, the first through hole is misaligned with the second through hole and the third through hole.

[0012] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the closing shaft, opening shaft, opening / closing indicator shaft, grounding operating shaft, and isolating operating shaft are respectively mounted on the housing cover via bearings. The housing cover is also mounted on the housing cover via bearings. Sealing rings are provided between the closing shaft, opening shaft, opening / closing indicator shaft, grounding operating shaft, isolating operating shaft, energy storage operating shaft, and energy storage indicator shaft and the housing cover.

[0013] Furthermore, the present invention provides a small, fully sealed solid-insulated switch, wherein the cover is fixed with a first guide seat, a second guide seat, a third guide seat, and a plurality of guide pins; the closing interlock plate passes through the first guide seat in a vertical direction; the first reset mechanism includes a first reset spring, the upper end of which presses against the first guide seat, and the lower end of which is fixed on the closing interlock plate; the grounding interlock plate passes through the second and third guide seats in a vertical direction; the second reset mechanism includes a second reset spring, the upper and lower ends of which press against the grounding interlock plate and the third guide seat respectively; and the circuit breaker interlock plate is provided with a second elongated hole corresponding to each guide pin and arranged in a vertical direction.

[0014] Compared with existing technologies, the present invention provides a small, fully sealed solid-insulated switch with the following advantages: The present invention uses a mechanism box and insulating cylinders. The mechanism box includes a housing and a cover sealed and fixed to the opening side of the housing. Three insulating cylinders are provided to correspond one-to-one with three-phase power. Each insulating cylinder contains a cylinder made of epoxy resin, and a circuit breaker assembly, a disconnector assembly, and a grounding assembly housed within the cylinder. The outer surface of the cylinder has a metal layer made using a hot-spray zinc process. The opening end of the cylinder is sealed and fixed to the housing. The circuit breaker assembly consists of an incoming conductor and a vacuum interrupter chamber enclosed within the cylinder. One end of the incoming conductor extends out of the cylinder, and the other end connects to the stationary contact of the vacuum interrupter chamber. The moving contact of the vacuum interrupter chamber faces the inner cavity of the cylinder and is connected to the circuit breaker mechanism housed in the mechanism box via an insulating pull rod. The disconnector assembly includes an outgoing conductor, an isolation support, and an isolation moving blade. The outgoing conductor is enclosed within the... In the cylindrical body, one end of the outgoing conductor extends out of the body, and the other end of the outgoing conductor has a slot facing the inner cavity of the cylinder. A first spring contact finger is installed on the inner wall of the slot through a first annular limiting groove. An isolation support is fixed in the inner cavity of the cylinder. The isolation support has a through hole, and a second spring contact finger is installed on the inner wall of the through hole through a second annular limiting groove. An isolating moving blade passes through the through hole and the second spring contact finger of the isolation support. One end of the isolating moving blade matches the slot of the outgoing conductor, and the other end of the isolating moving blade is connected to an isolation grounding mechanism in the mechanism box through an isolation pull rod. The grounding component is fixed in the inner cavity of the cylinder and electrically connected to the moving contact of the vacuum interrupter and the isolation support. A third spring contact finger is installed on the inner wall of the grounding stationary contact through a third annular limiting groove. A grounding moving contact that mates with the grounding stationary contact is installed on the isolation grounding mechanism and connected to the grounding busbar in the mechanism box. This constitutes a small, fully sealed solid-insulated switch with a compact structure, low cost, good safety, high reliability, and strong practicality. This invention, by setting up a mechanism box and an insulating cylinder, with the mechanism box consisting of a sealed and fixed box body and a box cover, and the insulating cylinder consisting of an epoxy resin cylinder containing a circuit breaker assembly, a disconnecting switch assembly, and a grounding assembly, and the cylinder being sealed and fixed to the box body, forms a fully sealed structure. This structure is suitable for various extreme working conditions such as high salt spray, high humidity, high wind and sand, high altitude, and high pollution. Compared with SF6 gas-insulated switches, it not only improves structural compactness, reduces volume and space occupation, which is conducive to miniaturization, but also improves sealing effect and safety reliability. By setting a metal layer made of thermal spray zinc on the outer surface of the cylinder, a continuous grounding layer is formed, which can ground and eliminate the induced charge generated by the high-voltage live components inside the cylinder, achieving the technical goal of keeping the insulating cylinder at zero potential during normal operation, thus enhancing safety reliability.

[0015] The present invention provides a detailed description of a small, fully sealed solid-insulated switch in conjunction with the specific embodiments shown in the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a front view of a small, fully sealed solid-insulated switch according to the present invention;

[0017] Figure 2 This is a right view of a small, fully sealed solid-insulated switch according to the present invention.

[0018] Figure 3 This is an isometric view of a small, fully sealed solid-insulated switch according to the present invention;

[0019] Figure 4 for Figure 2 AA direction view in the middle;

[0020] Figure 5 for Figure 4 A magnified view of a portion of position B in the middle;

[0021] Figure 6 This is an isometric view of the insulating cylinder in this invention;

[0022] Figure 7 This is a front view of the interlocking mechanism in this invention;

[0023] Figure 8 The isometric view of the interlocking mechanism in this invention Figure 1 ;

[0024] Figure 9 The isometric view of the interlocking mechanism in this invention Figure 2 ;

[0025] Figure 10 This is a rear view of the interlocking mechanism in this invention;

[0026] Figure 11 The isometric view of the interlocking mechanism in this invention Figure 3 ;

[0027] Figure 12 for Figure 7 CC view in the middle;

[0028] Figure 13 This is a front view of the interlocking component in this invention;

[0029] Figure 14 This is a top view of the interlocking component in this invention;

[0030] Figure 15 This is a bottom view of the interlocking component in this invention;

[0031] Figure 16 The isometric view of the interlocking assembly in this invention Figure 1 ;

[0032] Figure 17 This is a rear view of the interlocking component in this invention;

[0033] Figure 18 The isometric view of the interlocking assembly in this invention Figure 2 . Detailed Implementation

[0034] First, it should be noted that the directional terms such as up, down, left, right, front, and back used in this invention are merely descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this invention.

[0035] like Figures 1 to 18The present invention illustrates a specific embodiment of a small, fully sealed solid-insulated switch, comprising a mechanism box 1 and an insulating cylinder 2. The mechanism box 1 includes a box body 11 and a box cover 12 sealed and fixed to the opening side of the box body 11. Three insulating cylinders 2 are provided to match three-phase power, i.e., the three insulating cylinders 2 correspond one-to-one with the three-phase power to form three circuits. The insulating cylinder 2 is equipped with an epoxy resin cylinder body 21 and a circuit breaker assembly, a disconnector assembly, and a grounding assembly housed within the cylinder body 21. The outer surface of the cylinder body 21 is provided with a metal layer made using a thermal spray zinc process. The opening end of the cylinder body 21 is sealed and fixed to the box body 11. The circuit breaker assembly includes an incoming conductor 22 and a vacuum interrupter 23, both enclosed within the cylinder body 21. One end of the incoming conductor 22 extends out of the cylinder body 21, and the other end is connected to the stationary contact of the vacuum interrupter 23. The moving contact of the vacuum interrupter 23 faces the inner cavity of the cylinder body 21 and is connected to the circuit breaker mechanism 4 located in the mechanism box 1 via an insulating pull rod 3. The disconnector switch assembly includes an outgoing conductor 24, an isolation support 25, and an isolation blade 26. The outgoing conductor 24 is enclosed in a cylindrical body 21, with one end extending out of the cylindrical body 21 and the other end having a slot facing the inner cavity of the cylindrical body 21. A first spring contact finger 241 is installed on the inner wall of the slot via a first annular limiting groove. The isolation support 25 is fixed in the inner cavity of the cylindrical body 21. A through hole coaxial with the slot on the outgoing conductor 24 is provided on the isolation support 25, and a second spring contact finger 251 is installed on the inner wall of the through hole via a second annular limiting groove. The isolation blade 26 passes through the through hole and the second spring contact finger 251 of the isolation support 25, with one end of the isolation blade 26 matching the slot of the outgoing conductor 24. The other end of the isolation blade 26 is connected to the isolation grounding mechanism 6 located in the mechanism box 1 via an isolation pull rod 5. The grounding assembly is fixed in the inner cavity of the cylinder 21 and electrically connected to the moving contact of the vacuum interrupter 23 and the isolation support 25. A third spring contact finger 271 is installed on the inner wall of the grounding stationary contact 27 through an annular third limiting groove. A grounding moving contact 7 that cooperates with the grounding stationary contact 27 is installed on the isolation grounding mechanism 6, and the grounding moving contact 7 is connected to the grounding conductive bus (not shown in the figure) provided in the mechanism box 1.

[0036] The above configuration constitutes a compact, low-cost, safe, reliable, and practical small-scale fully sealed solid-insulated switch. This invention, by setting up a mechanism box 1 and an insulating cylinder 2, with the mechanism box 1 having a sealed and fixedly connected box body 11 and box cover 12, and the insulating cylinder 2 having an epoxy resin-made cylinder 21 containing a circuit breaker assembly, a disconnecting switch assembly, and a grounding assembly, and the cylinder 21 being sealed and fixed to the box body 11, forms a fully sealed structure. Compared with SF6 gas-insulated switches, this not only improves structural compactness, reduces volume and space occupation, facilitating miniaturization, but also improves sealing effect and safety reliability. By setting a metal layer made using a hot-spray zinc process on the outer surface of the cylinder 21, a continuous grounding layer is formed, allowing the induced charge generated by the high-voltage live components inside the cylinder 21 to be grounded and eliminated, ensuring that the insulating cylinder 2 is always at zero potential during normal operation, enhancing safety reliability. To facilitate understanding of this invention, the switch operation process is briefly described below. The switch closing operation sequence is: open circuit breaker—open grounding—close disconnecting—close circuit breaker. First, the circuit breaker mechanism 4 pulls the insulating rod 3 to separate the moving contact of the vacuum interrupter 23 from the stationary contact, thus completing the circuit breaker tripping action. Then, the isolation grounding mechanism 6 pulls the grounding moving contact 7 to separate it from the grounding stationary contact 27 and the third spring contact finger 271, thus completing the grounding tripping action. Next, the isolation grounding mechanism 6 pushes the isolation rod 5 to insert the isolation moving knife 26 into the slot on the outgoing conductor 24 and tightly fit it with the first spring contact finger 241, thus completing the isolation closing action. Finally, the circuit breaker mechanism 4 pushes the insulating rod 3 to tightly fit the moving contact of the vacuum interrupter 23 with the stationary contact, thus completing the circuit breaker closing action. This completes the switch closing process. At this point, the current flow in the main circuit is as follows: incoming conductor 22 — vacuum interrupter 23 — grounding stationary contact 27 — isolation support 25 — second spring contact finger 251 — isolation moving knife 26 — first spring contact finger 241 — outgoing conductor 24. The entire circuit is in the closed state. The grounding closing operation sequence is as follows: circuit breaker opening—isolation opening—grounding closing—circuit breaker closing. First, the circuit breaker mechanism 4 pulls the insulating rod 3 to separate the moving contact of the vacuum interrupter 23 from the stationary contact, thus completing the circuit breaker opening action. Next, the isolation grounding mechanism 6 pulls the isolation rod 5 to disengage the isolation moving knife 26 from the outgoing conductor 24 and the first spring contact finger 241, thus completing the isolation opening action. Then, the isolation grounding mechanism 6 pushes the grounding moving contact 7 to insert the grounding moving contact 7 into the grounding stationary contact 27 and tightly fit it with the third spring contact finger 271, thus completing the grounding closing action. Finally, the circuit breaker mechanism 4 pushes the insulating rod 3 to tightly fit the moving contact of the vacuum interrupter 23 with the stationary contact, thus completing the circuit breaker closing action.This completes the grounding and closing process. At this point, the main circuit current flows as follows: incoming conductor 22—vacuum interrupter 23—grounding stationary contact 27—third spring contact finger 271—grounding moving contact 7—grounding busbar. It should be noted that both the circuit breaker mechanism 4 and the isolation grounding mechanism 6 are existing devices in the field, and their structures, principles, and connections are well-known to those skilled in the art. In practical applications, to improve the ease of disassembling and assembling the insulating cylinder 2, this invention pre-embeds multiple circumferentially distributed internally threaded connectors at the open end of the cylinder 21, and fixes the cylinder 21 to the housing 11 with screws. To ensure the sealing reliability of the connection between the insulating cylinder 2 and the housing 11, this invention also provides a sealing groove at the open end of the cylinder 21, and installs a sealing gasket pressed against the housing 11 in the sealing groove. Similarly, this invention fixes the housing cover 12 to the housing 11 with screws to improve the ease of disassembly and assembly, and also provides a sealing gasket between the housing cover 12 and the housing 11 to ensure the sealing performance between them.

[0037] As an optimized solution, this specific embodiment incorporates an irregularly shaped high-voltage shielding mesh 28 and an internally threaded post 29 connected to the high-voltage shielding mesh 28 within the cylinder 21. The moving contact and isolation support 25 of the vacuum interrupter 23 are located within the high-voltage shielding mesh 28. The grounding stationary contact 27 and the isolation support 25 are fixed to the internally threaded post 29 via connecting bolts 210. The grounding stationary contact 27 is connected to the moving contact of the vacuum interrupter 23 via a conductive flexible connection 211. This structure, by incorporating the high-voltage shielding mesh 28 and connecting it to the moving contact and isolation support 25 of the vacuum interrupter 23 via the internally threaded post 29 and connecting bolts 210, effectively shields the field strength in this area, improving the performance stability and safety reliability of the insulating cylinder 2. As an optimization, this embodiment forms a tapered inlet sleeve 212 by extending the inlet conductor 22 and wrapping it with epoxy resin, facilitating connection of the inlet wire. An inlet sleeve shielding mesh 213, through which the inlet conductor 22 passes, is provided in the cylindrical body 21 at the root of the inlet sleeve 212 to shield the electric field strength in that area. Similarly, this embodiment forms an outlet sleeve 214 by extending the outlet conductor 24 and wrapping it with epoxy resin, facilitating connection of the outlet wire. An outlet sleeve shielding mesh 215, through which the outlet sleeve 214 passes, is provided in the cylindrical body 21 at the root of the outlet sleeve 214 to shield the electric field strength in that area. As an optimization, this specific embodiment also includes an arc-extinguishing chamber stationary end shielding mesh 216 and an isolation stationary seat shielding mesh 217 within the cylinder 21. These meshes are connected to the incoming conductor 22 and the outgoing conductor 24, respectively. The end of the incoming conductor 22 connecting to the vacuum arc-extinguishing chamber 23, as well as the stationary contact of the vacuum arc-extinguishing chamber 23, are both located within the arc-extinguishing chamber stationary end shielding mesh 216. The end of the outgoing conductor 24 with its slot is located within the isolation stationary seat shielding mesh 217. This structure, by including the arc-extinguishing chamber stationary end shielding mesh 216 and the isolation stationary seat shielding mesh 217, effectively shields the electric field strength in the corresponding areas, enhancing the performance stability and safety reliability of the insulating cylinder 2.

[0038] As an optimized solution, this specific embodiment includes a current transformer 218, a first capacitor power extraction device 219, and a second capacitor power extraction device 220 within the cylinder 21. The current transformer 218 is positioned around the incoming conductor 22, while the first and second capacitor power extraction devices 219 and 220 are connected to the incoming conductor 22 and the outgoing conductor 24 respectively via conductors 221. This configuration allows the current transformer 218 to monitor the current during switch operation, enabling timely detection of line faults or abnormalities and triggering the corresponding protection devices to disconnect the faulty circuit. This not only improves safety and reliability but also facilitates intelligent operation. Similarly, the first and second capacitor power extraction devices 219 and 220 can monitor the voltage on the incoming and outgoing sides, providing safety protection and fault monitoring while converting high-voltage AC to low-voltage DC to power low-voltage equipment. This achieves electrical isolation between the high and low voltage sides, enhancing safety and reliability. To monitor the operating status and parameters of the switch and thus improve the convenience and intelligence of control, this specific embodiment provides a temperature sensor for monitoring the temperature of the main circuit at the end of the slot of the outgoing conductor 24, a pressure sensor for monitoring the contact pressure of the vacuum interrupter 23 on the insulating pull rod 3, and a displacement sensor integrated on the isolation grounding mechanism 6 so as to monitor the moving distance of the isolation moving knife 26 and the grounding moving contact 7.

[0039] As an optimization solution, such as Figures 7 to 12As shown, in this specific embodiment, an interlocking mechanism 8 for operating the circuit breaker mechanism 4 and the isolation grounding mechanism 6 is provided on the cover 12, and the interlocking mechanism 8 adopts the following structure: a rotatable closing shaft 81, a opening shaft 82, an opening / closing indicator shaft 83, a grounding operation shaft 84, and an isolation operation shaft 85 are installed on the cover 12. The inner ends of the closing shaft 81, the opening shaft 82, and the opening / closing indicator shaft 83 are respectively connected to the circuit breaker mechanism 4. The outer end of the closing shaft 81 is fixed with a closing lever 811. The outer end of the opening / closing indicator shaft 83 is fixed with a swing arm 831. The inner ends of the grounding operation shaft 84 and the isolation operation shaft 85 are respectively connected to the isolation grounding mechanism 6. The outer ends of the grounding operation shaft 84 and the isolation operation shaft 85 are respectively fixed with a grounding cam 841 and an isolation cam 851. Meanwhile, a sliding closing interlock plate 86, a circuit breaking interlock plate 87, and a grounding interlock plate 88 are installed on the cover 12. A first reset mechanism is provided between the closing interlock plate 86 and the cover 12. The lower end of the closing interlock plate 86 abuts against the closing lever 811. An interlock assembly 89 is provided at the upper end of the closing interlock plate 86 to cooperate with the grounding cam 841 and the isolation cam 851. The interlock assembly 89 blocks the isolation operating shaft 85 when the grounding is closed, blocks the grounding operating shaft 84 when the isolation is closed, and prevents the closing interlock plate 86 from moving upward when the grounding is open and the isolation is open. A first elongated hole 871 in the left-right direction is provided in the middle of the circuit breaker interlock plate 87, and a lever 872 fixed on the swing arm 831 is provided in the first elongated hole 871, so that the lower end of the circuit breaker interlock plate 87 matches the cable compartment door of the switchgear, and the upper end of the circuit breaker interlock plate 87 adopts a U-shaped structure and is provided with grounding shaft baffle 873 and isolation shaft baffle 874 corresponding to the grounding operation shaft 84 and isolation operation shaft 85 when the circuit is broken and closed. A second reset mechanism is provided between the grounding interlock plate 88 and the box cover 12, so that the lower end of the grounding interlock plate 88 matches the cable compartment door of the switchgear, and the upper end of the grounding interlock plate 88 matches the grounding cam 841. This interlocking mechanism 8 has the characteristics of simple structure, convenient operation, and safety and reliability, and can effectively prevent misoperation. By setting up the interlock component 89, when the grounding is closed, the interlock component 89 blocks the isolating operating shaft 85, at which time the isolating operating shaft 85 cannot be operated. When the isolating is closed, the interlock component 89 blocks the grounding operating shaft 84, at which time the grounding operating shaft 84 cannot be operated. This achieves isolation and grounding interlocking, which can effectively prevent accidental closing of isolation and grounding. When the grounding is open and the isolating is open, the interlock component 89 prevents the closing interlock plate 86 from moving upward, which can effectively prevent accidental closing of the circuit breaker. That is to say, the circuit breaker closing action can only be completed when the grounding is closed or the isolating is closed.The opening / closing indicator shaft 83 is used to indicate the status of the circuit breaker mechanism 4. When the circuit breaker is closed, the opening / closing indicator shaft 83 rotates clockwise by a certain angle under the drive of the circuit breaker mechanism 4, and drives the circuit breaker interlock plate 87 to move upward through the swing arm 831 and the lever 872. This, in turn, blocks the grounding operation shaft 84 and the isolation operation shaft 85 through the grounding shaft baffle 873 and the isolation shaft baffle 874 respectively. At this time, grounding and isolation cannot be operated, which can effectively prevent accidental opening or closing of grounding and grounding. When the circuit breaker is open, the opening / closing indicator shaft 83 rotates counterclockwise by a certain angle under the drive of the circuit breaker mechanism 4, and drives the circuit breaker interlock plate 87 to move downward through the swing arm 831 and the lever 872. At this time, the lower end of the circuit breaker interlock plate 87 will block the cable compartment door of the switchgear so that it cannot be opened. The grounding shaft baffle 873 and the isolation shaft baffle 874 will correspondingly allow the blocking of the grounding operation shaft 84 and the isolation operation shaft 85. When the grounding circuit breaker is tripped, the grounding interlock plate 88 moves downward under the pressure of the grounding cam 841. At this time, the lower end of the grounding interlock plate 88 will press against the cable compartment door of the switchgear, preventing it from opening. When the grounding circuit breaker is closed, the grounding cam 841 moves away from the grounding interlock plate 88, and the grounding interlock plate 88 moves upward and away from the cable compartment door under the action of the second reset mechanism. Through the cooperation of the circuit breaker interlock plate 87 and the grounding interlock plate 88, the cable compartment door can only be opened when both the circuit breaker and the grounding are in the closed state, which can effectively prevent accidental entry into the electrical compartment and enhance safety and reliability. It should be noted that solid-insulated switches are usually installed in cabinets to form the switchgear for use, while the cable compartment refers to the part of the cabinet located on the lower side of the mechanism box.

[0040] As a specific implementation method, such as Figures 7 to 18As shown, the interlock assembly 89 of the present invention adopts the following structure: a U-shaped support plate 891 and an interlocking component 892 are provided. The rear side plate of the U-shaped support plate 891 is fixed to the cover 12. A first through hole 8911 corresponding to the closing interlocking plate 86 is provided on the bottom plate of the U-shaped support plate 891. A first guide hole 8912 and a second guide hole 8913 in the left and right directions are provided on the front side plate of the U-shaped support plate 891, with the second guide hole 8913 located at the lower right side of the first guide hole 8912. A first support component 893 and a second support component 894 are fixed to the right side of the first guide hole 8912 and the left side of the second guide hole 8913, respectively. The interlocking component 892 is provided inside the U-shaped support plate 891, and the interlocking component 892 is provided with a closing baffle 8921 and an interlocking baffle 8922 that are connected to each other. The 21 is provided with a second through hole 8923 and a third through hole 8924 distributed on the left and right. At both ends of the closing baffle 8921, a grounding push plate 8925 and an isolation push plate 8926 are provided to cooperate with the grounding cam 841 and the isolation cam 851, respectively. The two ends of the interlock baffle 8922 protrude from the grounding push plate 8925 and the isolation push plate 8926, respectively. On the interlock baffle 8922, strip holes 8927 in the left and right directions are respectively provided at positions corresponding to the first support member 893 and the second support member 894. A first guide member 895 and a second guide member 896 corresponding to the first guide hole 8912 and the second guide hole 8913 are fixed on the interlock baffle 8922. A return spring 897 is respectively provided between the first guide member 895 and the first support member 893, and between the second guide member 896 and the second support member 894. In this configuration, when grounding is engaged, the interlock component 892 moves to the left, aligning the second through hole 8923 with the first through hole 8911. When isolating is engaged, the interlock component 892 moves to the right, aligning the third through hole 8924 with the first through hole 8911. When the interlock component 892 is in the neutral position, the first through hole 8911 is misaligned with the second through hole 8923 and the third through hole 8924. This interlock assembly 89 features a simple structure, low cost, and stable reliability.By setting staggered first guide holes 8912 and second guide holes 8913, and corresponding first guide members 895 and second guide members 896 in the first guide holes 8912 and second guide holes 8913, and by setting return springs 897 between the first guide member 895 and the first support member 893, and between the second guide member 896 and the second support member 894, the interlocking member 892 can automatically return to the intermediate balance position by the elastic force of the return springs 897 when no external force is applied. At this time, the second through hole 8923 and the third through hole 8924 are staggered from the first through hole 8911, and the closing baffle 8921 can prevent the closing interlocking plate 86 from moving upward, thus preventing the circuit breaker closing operation. When the grounding is closed, the grounding operating shaft 84 is rotated counterclockwise, and the grounding cam 841, driven by the grounding operating shaft 84, pushes the interlocking member 892 to the left through the grounding push plate 8925. The portion of the interlock baffle 8922 that protrudes from the isolation push plate 8926 on the left end can block the isolation operating shaft 85, preventing its operation. The second through hole 8923 overlaps with the first through hole 8911, allowing the upper end of the closing interlock plate 86 to pass through both the first through hole 8911 and the third through hole 8924 simultaneously for circuit breaker closing. During isolation closing, rotating the isolation operating shaft 85 clockwise activates the isolation cam 851. Driven by the shaft 85, the interlocking component 892 is pressed to the right by the isolation push plate 8926. At this time, the part protruding from the right end of the interlock baffle 8922 onto the grounding push plate 8925 can block the grounding operating shaft 84, preventing its operation. Meanwhile, the third through hole 8924 coincides with the first through hole 8911, allowing the upper end of the closing interlock plate 86 to pass through both the first through hole 8911 and the third through hole 8924 simultaneously for circuit breaker closing. Through the above settings and operations, isolation and grounding interlocking are achieved, preventing both from being performed simultaneously. It should be noted that the terms "circuit break closing" and "circuit breaker closing" in this article should be understood as the same concept, referring to the state when the moving and stationary contacts of the vacuum interrupter 23 are engaged. Similarly, "isolation closing" and "isolation closing" should be understood as the same concept, referring to the state when the isolating moving knife 26 is inserted into the outgoing conductor 24 and the three are connected through the first spring contact finger 241. The terms "grounding closing" and "grounding closing" should also be understood as the same concept, referring to the state when the grounding moving contact 7 is inserted into the grounding stationary contact 27 and the three are connected through the third spring contact finger 271.

[0041] In a specific embodiment of the rotating installation, the closing shaft 81, opening shaft 82, opening / closing indicator shaft 83, grounding operating shaft 84, and isolating operating shaft 85 are respectively mounted on the housing cover 12 via bearings 803. An energy storage operating shaft 801 and an energy storage indicator shaft 802 are also mounted on the housing cover 12 via bearings 803 to provide assistance for circuit breaker closing. To ensure the sealing reliability of each shaft's mounting position, a sealing ring 804 is provided between the closing shaft 81, opening shaft 82, opening / closing indicator shaft 83, grounding operating shaft 84, isolating operating shaft 85, energy storage operating shaft 801, and energy storage indicator shaft 802 and the housing cover 12. As a specific embodiment where the interlocking plates can slide up and down, the present invention fixes a first guide seat 861, a second guide seat 881, a third guide seat 882, and multiple guide pins 875 on the cover 12. Correspondingly, the closing interlocking plate 86 passes through the first guide seat 861 in the vertical direction, the grounding interlocking plate 88 passes through the second guide seat 881 and the third guide seat 882 in the vertical direction, and the circuit breaking interlocking plate 87 is provided with a second elongated hole 876 corresponding to the guide pins 875 and in the vertical direction. Among them, the first reset mechanism is provided with a first reset spring 862, the upper end of the first reset spring 862 presses against the first guide seat 861, and the lower end of the first reset spring 862 is fixed on the closing interlocking plate 86; the second reset mechanism is provided with a second reset spring 883, the upper and lower ends of the second reset spring 883 correspondingly press against the grounding interlocking plate 88 and the third guide seat 882.

[0042] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications made by those skilled in the art based on the technical solutions of the present invention without departing from the design concept of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A small, fully sealed solid-insulated switch, comprising a mechanism box (1) and insulating cylinders (2), the mechanism box (1) comprising a box body (11) and a box cover (12) sealed and fixed to the opening side of the box body (11), and the insulating cylinders (2) comprising three cylinders, characterized in that, The insulating cylinder (2) includes a cylinder (21) made of epoxy resin and a circuit breaker assembly, a disconnector assembly, and a grounding assembly located within the cylinder (21). The outer surface of the cylinder (21) is provided with a metal layer made using a hot-spray zinc process. The open end of the cylinder (21) is sealed and fixed to the housing (11). The circuit breaker assembly includes an incoming conductor (22) and a vacuum interrupter (23) both enclosed within the cylinder (21). One end of the incoming conductor (22) extends out of the cylinder (21), and the other end of the incoming conductor (22) is connected to the vacuum interrupter. The stationary contact of the arc-extinguishing chamber (23) is connected, and the moving contact of the vacuum arc-extinguishing chamber (23) faces the inner cavity of the cylinder (21) and is connected to the circuit breaker mechanism (4) set in the mechanism box (1) through the insulating pull rod (3). The disconnecting switch assembly includes an outgoing conductor (24), an isolation support (25), and an isolation moving knife (26). The outgoing conductor (24) is wrapped in the cylinder (21), one end of the outgoing conductor (24) extends out of the cylinder (21), and the other end of the outgoing conductor (24) is provided with a slot facing the inner cavity of the cylinder (21). The inner wall of the slot is A first spring contact finger (241) is installed through a first annular limiting groove. An isolation support base (25) is fixed in the inner cavity of the cylinder (21). The isolation support base (25) has a through hole. A second spring contact finger (251) is installed on the inner wall of the through hole through a second annular limiting groove. An isolation moving knife (26) passes through the through hole and the second spring contact finger (251) of the isolation support base (25). One end of the isolation moving knife (26) is matched with the slot of the outgoing conductor (24). The other end of the isolation moving knife (26) is connected to the isolation pull rod (5) via the first limiting groove. The isolation grounding mechanism (6) is connected in the mechanism box (1). The grounding assembly includes a grounding stationary contact (27) fixed in the inner cavity of the cylinder (21) and electrically connected to the moving contact of the vacuum interrupter (23) and the isolation support (25). A third spring contact finger (271) is installed on the inner wall of the grounding stationary contact (27) through an annular third limiting groove. A grounding moving contact (7) that cooperates with the grounding stationary contact (27) is installed on the isolation grounding mechanism (6). The grounding moving contact (7) is connected to the grounding conductive busbar in the mechanism box (1). The cylindrical body (21) is provided with an irregularly shaped high-voltage shielding mesh (28) and an internally threaded column (29) connected to the high-voltage shielding mesh (28). The moving contact and the isolation support (25) of the vacuum interrupter (23) are located in the high-voltage shielding mesh (28). The grounding stationary contact (27) and the isolation support (25) are fixed to the internally threaded column (29) by connecting bolts (210). The grounding stationary contact (27) is connected to the moving contact of the vacuum interrupter (23) through a conductive flexible connection (211). The protruding end of the conductor (22) and the epoxy resin wrapped around it form an inlet sleeve (212). The inlet sleeve shielding mesh (213) through which the inlet conductor (22) passes is provided in the cylinder (21) at the root position of the inlet sleeve (212). The protruding end of the outlet conductor (24) and the epoxy resin wrapped around it form an outlet sleeve (214). The outlet sleeve shielding mesh (215) through which the outlet sleeve (214) passes is provided in the cylinder (21) at the root position of the outlet sleeve (214).

2. The miniature fully sealed solid-insulated switch according to claim 1, characterized in that, The cylinder (21) is provided with an arc-extinguishing chamber stationary end shielding mesh (216) and an isolation stationary seat shielding mesh (217). The arc-extinguishing chamber stationary end shielding mesh (216) and the isolation stationary seat shielding mesh (217) are connected to the incoming conductor (22) and the outgoing conductor (24) respectively. The end of the incoming conductor (22) connected to the vacuum arc-extinguishing chamber (23) and the stationary contact of the vacuum arc-extinguishing chamber (23) are both located in the arc-extinguishing chamber stationary end shielding mesh (216). The end of the outgoing conductor (24) with the slot is located in the isolation stationary seat shielding mesh (217).

3. The miniature fully sealed solid-insulated switch according to claim 2, characterized in that, The cylinder (21) is provided with a current transformer (218), a first capacitor power extraction device (219) and a second capacitor power extraction device (220). The current transformer (218) is located around the incoming conductor (22). The first capacitor power extraction device (219) and the second capacitor power extraction device (220) are respectively connected to the incoming conductor (22) and the outgoing conductor (24) through wires (221).

4. The miniature fully sealed solid-insulated switch according to claim 3, characterized in that, The end of the slot of the outgoing conductor (24) is provided with a temperature sensor for monitoring the temperature of the main circuit. The insulating pull rod (3) is provided with a pressure sensor for monitoring the contact pressure of the vacuum interrupter (23). The isolation grounding mechanism (6) integrates a displacement sensor, which is used to monitor the moving distance of the isolation moving knife (26) and the grounding moving contact (7).

5. The miniature fully sealed solid-insulated switch according to claim 1, characterized in that, The enclosure cover (12) is provided with an interlocking mechanism (8) for operating the circuit breaker mechanism (4) and the isolation and grounding mechanism (6). The interlocking mechanism (8) includes a closing shaft (81), a opening shaft (82), an opening / closing indicator shaft (83), a grounding operation shaft (84), and an isolation operation shaft (85) rotatably mounted on the enclosure cover (12). The inner ends of the closing shaft (81), the opening shaft (82), and the opening / closing indicator shaft (83) are respectively connected to the circuit breaker mechanism (4). The outer end of the closing shaft (81) is fixed with a closing lever (811), and the outer end of the opening / closing indicator shaft (83) is fixed with a closing lever (811). A swing arm (831) is fixed. The inner ends of the grounding operating shaft (84) and the isolation operating shaft (85) are respectively connected to the isolation grounding mechanism (6). The outer ends of the grounding operating shaft (84) and the isolation operating shaft (85) are respectively fixed with a grounding cam (841) and an isolation cam (851). The interlocking mechanism (8) also includes a sliding closing interlock plate (86), a circuit breaking interlock plate (87), and a grounding interlock plate (88). A first reset mechanism is provided between the closing interlock plate (86) and the box cover (12). The lower end of the closing interlock plate (86) abuts against the closing lever (811). On the circuit breaker interlock plate (86), an interlock assembly (89) is provided at the upper end of the closing interlock plate (86) to cooperate with the grounding cam (841) and the isolation cam (851). The interlock assembly (89) blocks the isolation operating shaft (85) when the grounding is closed, and blocks the grounding operating shaft (84) when the isolation is closed. The interlock assembly (89) prevents the closing interlock plate (86) from moving upward when the grounding is open and the isolation is open. The circuit breaker interlock plate (87) has a first elongated hole (871) in the middle of the circuit breaker interlock plate (87) in the left and right direction. The first elongated hole (871) is provided with a fixed arm (851). The lever (872) on 831) is matched with the lower end of the circuit breaker interlock plate (87) and the cable compartment door of the switch cabinet. The upper end of the circuit breaker interlock plate (87) is U-shaped and is provided with a grounding shaft baffle (873) and an isolation shaft baffle (874) that block the grounding operation shaft (84) and the isolation operation shaft (85) when the circuit is closed. A second reset mechanism is provided between the grounding interlock plate (88) and the box cover (12). The lower end of the grounding interlock plate (88) is matched with the cable compartment door of the switch cabinet, and the upper end of the grounding interlock plate (88) is matched with the grounding cam (841).

6. The miniature fully sealed solid-insulated switch according to claim 5, characterized in that, The interlock assembly (89) includes a U-shaped bracket plate (891) and an interlocking component (892). The rear side plate of the U-shaped bracket plate (891) is fixed to the cover (12). The bottom plate of the U-shaped bracket plate (891) is provided with a first through hole (8911) corresponding to the closing interlock plate (86). The front side plate of the U-shaped bracket plate (891) is provided with a first guide hole (8912) and a second guide hole (8913) in the left and right directions. The second guide hole (8913) is located on the lower right side of the first guide hole (8912). The right side of the first guide hole (8912) is... A first support member (893) and a second support member (894) are fixed to the left side of the second guide hole (8913). An interlocking member (892) is located inside the U-shaped bracket plate (891). The interlocking member (892) includes a closing baffle (8921) and an interlocking baffle (8922) connected to each other. The closing baffle (8921) is provided with a second through hole (8923) and a third through hole (8924) distributed on the left and right sides. The two ends of the closing baffle (8921) are provided with grounding push plates (841 and 851) that cooperate with the grounding cam (841) and the isolation cam (851). 925) and isolation push plate (8926), the two ends of the interlock baffle (8922) are respectively protruding ground push plate (8925) and isolation push plate (8926), the interlock baffle (8922) is provided with left and right strip holes (8927) at positions corresponding to the first support member (893) and the second support member (894), and the interlock baffle (8922) is fixed with a first guide member (895) and a second guide member (896) corresponding to the first guide hole (8912) and the second guide hole (8913), the first guide member (895) and the second guide member (8926) are respectively provided with left and right strip holes (8927) at positions corresponding to the first support member (893) and the second support member (894), the first guide member (895) and the second guide member (8926) are respectively provided with left and right strip holes (8927) at positions corresponding to the first support member (893) and the second support member (894), the first guide member (895) and the second guide member (8926) are respectively provided with left and right strip holes (8927) at positions corresponding to the first support member (893) and the second guide member (8913 ... A centering spring (897) is provided between the support member (893) and between the second guide member (896) and the second support member (894); when the ground is closed, the interlock member (892) moves to the left and makes the second through hole (8923) coincide with the first through hole (8911); when the isolation is closed, the interlock member (892) moves to the right and makes the third through hole (8924) coincide with the first through hole (8911); when the interlock member (892) is in the middle position, the first through hole (8911) is misaligned with the second through hole (8923) and the third through hole (8924).

7. The miniature fully sealed solid-insulated switch according to claim 6, characterized in that, The closing shaft (81), opening shaft (82), opening / closing indicator shaft (83), grounding operation shaft (84), and isolation operation shaft (85) are respectively mounted on the housing cover (12) via bearings. The housing cover (12) is also mounted on the energy storage operation shaft (801) and energy storage indicator shaft (802) via bearings. The closing shaft (81), opening shaft (82), opening / closing indicator shaft (83), grounding operation shaft (84), isolation operation shaft (85), energy storage operation shaft (801), and energy storage indicator shaft (802) are respectively provided with sealing rings between them and the housing cover (12).

8. The miniature fully sealed solid-insulated switch according to claim 6, characterized in that, The cover (12) is fixed with a first guide seat (861), a second guide seat (881), a third guide seat (882) and a plurality of guide pins (875). The closing interlock plate (86) passes through the first guide seat (861) in the vertical direction. The first reset mechanism includes a first reset spring (862). The upper end of the first reset spring (862) presses against the first guide seat (861). The lower end of the first reset spring (862) is fixed on the closing interlock plate (86). The grounding interlock plate (88) passes through the second guide seat (881) and the third guide seat (882) in the vertical direction. The second reset mechanism includes a second reset spring (883). The upper and lower ends of the second reset spring (883) press against the grounding interlock plate (88) and the third guide seat (882) respectively. The circuit breaking interlock plate (87) is provided with a second elongated hole (876) that corresponds one-to-one with the guide pins (875) and is in the vertical direction.

Images